Purple staffs?

I've recently picked up a purple staff and found out its a rare item..

but when i went to idenify it..

it onli states highly salvagble or precious.

1) does it mean it can onli be salvaged can't be use? or does it mean i can use it to craft items?

2) wad does stacking mean?

3) wad are the artifacts for?

1) You can use it, however, it will opperate no different than any other staff with the same stats. If you do salvage it, you have a greater chance of getting rare crafting materials (especially with an advanced salvage kit) or a greater number of normal crafting materials.

2)Stacking means two things depending on if your talking about items or spells. Since we are talking about items: item stacking 101, when more than one item can be combined to fit into only one inventory slot. Example--if you have 1 wood and 1 wood, you can pick up one of the 1 woods and click the other 1 wood, you will now have 2 wood in one slot. If you have a warhammer and a warhammer, you cannot do this. Wood stacks, warhammers dont.

3)Artifacts? Dont know what an artifact is, so Im gonna go with there is no such thing, unless they have patched the game in the last 20 hours (I been working).